CHM1025C
Module One: Sample Exam Homework ANSWERS
Part D: Chemical/Physical/Nuclear Change 5 points
State whether each of the following is a physical change, a chemical change,
or a nuclear change:
___chemical ______1. Electricity
decomposes water.
___ physical ______ 2.
Methanol dissolves in gasoline
___ physical_______ 3. Dry ice pellets
disappear
___ chemical _____ 4. Iron
oxidizes to rust
___ physical _____ 5. Bromine vaporizes into a reddish-brown
gas
___ nuclear______ 6. Uranium-235 splits into two small elements
when bombarded
with
neutrons in an atomic bomb.
___ physical ______7. Copper
conducts heat
___ chemical _____8. Baking
soda fizzes in vinegar
____ physical _____9. Grinding sugar crystals into a powder
____ chemical ____10. Sodium reacts with chlorine gas
____ physical _____11. Adding
air to a tire
____ physical _____12. Slicing an orange into wedges
____ nuclear _____13. Hydrogen atoms fuse into helium atoms
in a hydrogen bomb
____ physical _____14.” Dry ice”(Solid Carbon dioxide) vaporizes (sublimes) into a
gas at room temperature and sea level pressure
____ chemical ____15. Natural Gas burns with a blue flame